Trams are now commonly included in the wider term " light rail", which also includes grade-separated systems. If necessary, they may have dual power systems-electricity in city streets and diesel in more rural environments. In some cases, a contact shoe on a third rail is used. Today, most trams use electrical power, usually fed by a pantograph sliding on an overhead line older systems may use a trolley pole or a bow collector. Tram vehicles are usually lighter and shorter than main line and rapid transit trains. Many recently built tramways use the contemporary term light rail. The tramlines or networks operated as public transport are called tramways or simply trams/streetcars. Siemens tram in Almada near LisbonĪ tram (called a streetcar or trolley in USA) is a rail vehicle that travels on tramway tracks on public urban streets some include segments on segregated right-of-way. With more than 14,000 units built, Tatra T3 is the most widely produced tram model in history.
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